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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >In Situ STM Studies on the Underpotential Deposition of Antimony on Au(111) and Au(100) in a BMIBF_4 Ionic Liquid
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In Situ STM Studies on the Underpotential Deposition of Antimony on Au(111) and Au(100) in a BMIBF_4 Ionic Liquid

机译：原位STM研究BMIBF_4离子液体中Au（111）和Au（100）上的锑欠位沉积

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In this article, the underpotential deposition (UPD) of Sb on Au(11) and Au(100) over a wide potential range in a BMIBF4 ionic liquid containing SbCl_3 is investigated by cyclic voltammetry and in situ scanning tunneling microscopy (STM). The cyclic voltammograms of the two surfaces show similar features of Sb UPD, which is kinetically sluggish at high underpotential shift but rapid at low underpotential shift with a large and broad reduction peak. The total charge flux associated with the UPD suggests an equivalent of nearly 1 ML quantity of Sb deposit. In situ STM results showed precursor adsorption and several stages of the UPD. The prior UPD reversible adsorption of SbCl_3 precursor occurs only on Au(111) with an ordered hexagonal array of six- and seven-membered clusters in (√31 X √31)R8.9° registration with the Au(111) surface. On both Au(111) and Au(100), the initial stage of Sb UPD (from -0.2 to -0.4 V) proceeds with the formation of similar short atomic strips of Sb atoms with a length of 2-2.5 nm and a width of two atoms. The average coverage of the Sb atoms is ca. 0.24 ML at -0.4 V with an electrosorption valency of close to 3. In the later stage of Sb UPD (from -0.45 to -0.65 V), dramatically different behaviors were observed on Au(111) and Au(100). On Au(111), a multilevel feature of (√3 X √3)R30° structure was observed at a fractional coverage with a small quantity of Sb aggregates at the top level. This was followed by a two-layer surface alloying at potentials close to that of Sb bulk deposition. On Au(100), however, the formation of a distinct second layer composed of islands of ~4 nm was the sole characteristic at this stage. No surface alloying appeared on Au(100). These features contrast those observed in aqueous solutions containing oxygeneous SbO~+ species and display profound medium effects on the UPD of Sb. Discussions of these observations, especially the possible origin of the clusters on Au(111) and the structural invariance of the atomic strips on Au(111) and Au(100), is provided in view of mutual interactions at the interface that are modified by the environment of the ionic liquid.
机译：在本文中，通过循环伏安法和原位扫描隧道显微镜（STM）研究了含有SbCl_3的BMIBF4离子液体中Sb在宽电位范围内在Au（11）和Au（100）上的欠电位沉积（UPD）。两个表面的循环伏安图显示了Sb UPD的相似特征，Sb UPD在高电位下移动时动力学缓慢，但在低电位下移动时迅速，且具有大而宽的还原峰。与UPD相关的总电荷通量表明，相当于大约1 ML的Sb沉积物。原位STM结果显示了前体吸附和UPD的几个阶段。先前的UPD对SbCl_3前体的可逆吸附仅发生在具有六元和七元簇的有序六边形阵列的Au（111）上，并与Au（111）表面对齐（√31X√31）R8.9°。在Au（111）和Au（100）上，Sb UPD的初始阶段（从-0.2到-0.4 V）继续进行，形成了相似的Sb原子短原子条，长度为2-2.5 nm，宽度为两个原子。 Sb原子的平均覆盖率约为。在-0.4 V时0.24 ML，电吸附价接近3。在Sb UPD的后期（从-0.45至-0.65 V），在Au（111）和Au（100）上观察到明显不同的行为。在Au（111）上，在部分覆盖率下观察到（√3X√3）R30°结构的多级特征，顶层有少量Sb聚集体。随后是两层表面合金化，其电势接近Sb体沉积的电势。然而，在Au（100）上，此阶段唯一的特征是形成由〜4 nm的岛组成的独特的第二层。在Au（100）上没有表面合金化。这些特征与在含氧SbO〜+物质的水溶液中观察到的特征形成对比，并对Sb的UPD表现出深远的介质影响。考虑到在界面处的相互作用，这些修饰的讨论，特别是Au（111）上团簇的可能起源以及Au（111）和Au（100）上原子条的结构不变性的讨论。离子液体的环境。

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